<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="demo">
    <button @click="$destory()">destory vm</button>
    <p v-show='isShow'>加油</p>
  </div>
  <script src="../js/vue.js"></script>
  <script>
    new Vue({
      el:'#demo',
      data(){
        return{
          isShow:true
        }
      },
      mounted(){
        this.itervalId=setInterval(()=>{
          this.isShow=!this.isShow
        },1000)
      },
      beforeDestory(){
        clearInterval(this.itervalId)
      }
    })
  </script>
</body>
</html>